Compressor pump



Allg. 31, 1937. Q F, DAVIS 2,091,752

COMPRES SOR PUMff Filed sept. 24, 1935 2 sheets-sheet 1 C. F. DAVIS COMPRESSOR PUMP Aug. 31, 1937.

Filed Sept. 24, 1935 2 SheetsSheet 2 Patented Aug. 3l, 1937 UNITED STATES PATENT oFFicE commission PUMP Gland Fleming Davis, Pineville, Ky. Application september 24, A1935, serial Np. 41,927

4 claims. (ci. zzo-139) My invention consists in new and useful improvements in compressor pumps, and although fthe principle here involved may be readily applied i n connection with various types of pumps,

compressors and motors, the apparatus hereinafter. described is more particularly 'adapted for use as a compressor pump in connection with electric refrigeration apparatus.

The primary object of my invention is to provide a compressor pump of this typefconstructed with a minimum of moving parts and one which can be economically manufactured.

Another object of my invention is to provide a device of this character wherein the parts are so constructed and arranged as to be in substantially perfect balance at all times.

It naturally follows that a further object of the invention is the elimination of vibration and consequently-the reduction of noise to a minimum.

A still further object is to provide a compressor pump including a substantially elliptical barrel with a. cylindrical compressor block located concentrically therein and wherein the sliding heads of the compressor block are constantly maintained in seating engagement with the inner periphery of the barrel by the pressure developed in the unit.

With the above and other objects in view which 30 will appear as the description proceeds, my invention consists in the novel features herein set forth, illustrated in the accompanying drawings and more particularly pointed out in the ap-l pended claims. y

Referring to the drawi`ngs in which numerals of like character designate similar parts throughout the several views,

Fig. l is a vertical sectional view of my improved compressor pump assembled.

Fig. 2 is a horizontal section taken on line 2-'2 of Fig. 1.

Fig. 3 is a sectional view taken on line 3-3 of Fig. 1.

Fig. 4 is a vertical sectional view taken on line "-4 of Fig. 3.

Fig. 5 is a perspective view from the upper end of the compressor block, and

Fig. 6 is a similar view from the lower end of the block.

vIn the drawings, I represents a casing preferably hermeticallysealed with a suitable cover 2, the lower portion of said casing forming an annular oil reservoir 3. The outer walls of the casing are preferably provided with conventional radiator iins 4 disposed around its periphery.

Within the casing, I provide a vertically` disposed electric motorA M comprising a stator 5 and a rotor 6, the latter being preferably mounted on a hollow shaft l which is supported at its upper end in a suitable bearing member 8 adapt- 5 ed to be screwed into the central portion of the cover 2 as clearly shown in Fig. 1.

'I'he lower end of the shaft 'I is xed in any suitable manner to the top plate II of an elliptical barrel 9 which is horizontally disposed in 10 the lower portion of the casing I adjacent the upper extremity of the reservoir 3. The barrel 9 has a cylindrical outer surface but is provided internally with an elliptical chamber I 0 closed on its top side by the barrel plate I I and open at 15 its lower side. In the form of my invention shown in the drawings, this barrel Ill is supported on -the raised bottom of/the casing I and is rotatably mounted in a circular guideway I2 formed on said bottom. j

Within the elliptical chamber III of the barrel I, I provide a stationary cylindrical compressor block I3 which it suitably secured in any con- I venient manner to the adjacent portion of the bottom of casing I, said block extending vertical- 25 ly to the top of the chamber I0 with a suitable lubricating clearance between its upper extremity and the plate II. 'Ihis block I3 is preferably formed from a solid cylindrical piece of meta-l and is provided centrally with a fluid pressure 30 well Il open at its top and closed at its bottom.

The periphery of the block I3 is provided at z predetermined points with transverse slots or recesses I5 `and I8 which extend axially of the block to within a relatively short distance from 35 the walls of the well I4 as shown in Figs. 5 and 6.

In these recesses I provide heads I5' and I6', respectively, which are capable of a radial sliding movement and adapted to engage the inner periphery of the elliptical barrel 9 with their 40 outer ends in seating engagement therewith, thereby dividing the ellipse into high'pressure sides H and low pressure sides L as shown in Figs.

2 and 3.

An inletconduit I'I leads from a suitable source 45 of gas or otheriiuid to be compressed to an inlet opening I 8 located in the bottom of the casing I preferably concentric with the compressor block I3. An oil passageway I9 connected at one end to an inlet tube 20 in the reservoir 3 places 50 said reservoir in communication with the inlet I8, whereby oil from said reservoir joins a stream of gas or other fluid to be compressed entering the casing through inlet I Il. Y.

Adjacent the inlet I8, the underside of the compressor block is inset as at 2| (Figs. 1 and 6) to form a circular inlet channel for incoming oil and gas. The low pressure sides L of the elliptical chamber III are in communication with the 5 channel 2| by means of slots 22 extending through the peripheryv of the block I3, terminating in ports 23 drilled vertically from the underside of the block I3, .said ports 23 communicating with the channel 2| by means of grooves 24.

Thus, uid entering the channel 2| through con-` duit I1 and oil passageway I9, ows through the grooves 24 into the ports 23 and out through slots 22 into the low side L of the chamber I0.

The high pressure sides H of the elliptical barrel I0 are in communication with the well I4 by means of peripheral slots 25 inthe block I3 which open into ports 261drilled from the top side of the block, grooves 21 leading from the upper extremities of the ports 26 to the well I4. Thus, the compressed uid from the high sides of the barrel flow from said high sides through slots 25, ports 26 and grooves 21 into the pressure Well I4.

In order to constantly maintain a seating engagement of the outer ends of the sliding heads I5 and I6 with the walls of the elliptical chamber III, I provide ports 31 leading from the pressure well I4 to the recesses I5 and I6, behind the respective heads. Thus these heads are forced radially into seating engagement by the pres- 40 shape is suitably secured in the upper portion of the casing I with its outer extremities in slightly spaced relation to thev inner walls of the casing I, said baille extending substantially across the i upper portion of the casing and located just 5 below the passageways 29 in the shaft 1.

An outlet conduit 3| leads from a point under the baille but above the lower extremity thereof and extends out through the 4bottom of the casing I as shown at 32 in Fig. 1, from whence the 50 compressed uid is conducted to a suitable point y of use. l

In order to compensate for wear of' the rotary parts, I preferably provide at the upper e'nd of the hollow shaft 1 a coil spring or the like 33 55 which is interposed between the shaft and the upper end of the bearing member 8, a washer 34 being preferably located between thelspring 33 and this shaft. This washer is provided with a central opening 35 whereby oil carried upwardly through the conduit 28 finds its way through the washer and thoroughly lubricates the upper end of the shaft 1.

Having thus described the construction and assemblycf my improved compressor pump, its

65 operation is as follows:-

We will assume that the reservoir 3 has been filled to a predetermined level shown in dotted lines in Fig. 1 with a, suitable lubricating oil, a glassliquid level gauge 36 being preferably 70 provided to indicate the oil level. The motor is started and the barrel 9 begins to rotate in counterclockwise direction, the compressor block I3 remaining stationary` 'I'he rotation of the barrel 9 causes a vacuum to be created in the 75 low pressure sides L of the elliptical chamber sealed casing, a truly elliptical through slots 25, ports 26 and grooves 21 into the pressure well I4.

It will be noted that during this entire operation, the oil carried with the gas forms a constant film over all adjacent moving parts eachv half revolution of the barrel 9, thus thoroughly lubricating and protecting said parts. Furthermore, the pressure maintained in the well I4 is applied through openings 31 to' the inner sides of the heads I5' and I6', thereby constantly forcing these heads outwardly into seating engagement with the inner periphery of the elliptical barrel 9.

Due to the fact that these heads are continuously moved inwardly and outwardly in the slots or recesses I5 and I6, the oil and gas entering the well I4 are continuously subjected to an agitation and thorough mixing, this compressed mixture being conducted upwardly through the passageway 28 in shaft 1 and discharged therefrom onto the top side of the baille plate 30.

'I'he oil and gas then separate, the oil running down the top of the baille and finding its way through the various clearances in the motor parts back to the reservoir 3. 'I'he gas substantially free from oil enters the upper end of the outlet conduit 3|l and is conducted to the refrigerating unit or other pointof use.

While I have shown and described a device wherein the barrel is rotatable with respect to the compressor block, it is to be understood that I do not intend to confine myself to this particular form of structure. In other words, I may, within the scope of this invention, employ a stationary barrel with a rotary block. Furthermore, while I have shown and described a hermetically sealed casing enclosing both motor andv compressor, the basic features of my compressor unit may be employed with equal effect in connection with a device driven either directly or indirectly by a, motor located within or without the casing.

From the foregoing it is believed that my invention may be readily understood by those skilled in the art without furtherdescription, itv

being borne in mind that numerous changes may be made in the details disclosed without departing from the spirit of my invention as set out in the following claims.

What I claim and desire to secure by Letters Patent isz- 1. In a motor compressor unit, an hermetically barrel, a cylindrical compressor block concentrically disposed in said barrel, an electric motor in said casing for rotating one of said members with respect to the other, a pressure fluid well centrally locatedin said block, transverse recesses in the periphery of said block, radially slidable heads in said recesses adapted to seat against the inner periphery of said barrel and dividing the ellipse into high and low pressure sides, a uid inlet adjacent said block, a passageway through said block from said inlet to said low pressure side, a passageway through said block from said high pressure side to said well, a discharge conduit leading from said well through the motor shatt and opening in communication with the ,upper portion oi' said casing, a bame' plate in the upper portion of said casing below the opening oi said discharge conduit,v and a discharge passageway extending from a point below said baille to the exterior ot said casing.

2. In a compressor pump, a casing, a iluid inlet in the bottom oi said casing, a truly elliptical barrel, a cylindrical compressor block concentrically disposed in said barrel, said compressor block comprising a cylindrical body drilled centrally in an axial direction from its upper side to form a pressure iluid well, and drilled concentrically with said well from its underside to form an inlet channel in communication with said huid inlet.

transverse recesses in the periphery of said block, radially movable heads in said recesses adapted to seat against the inner periphery ot said barrel and dividing the ellipse into high and low pressure sides, vertical passageways drilled from the underside of said block to a predetermined depth, means for connecting said passageways with said inlet channel and low pressure sides of the barrel, vertical passageways drilled from the top oi said block to a predetermined depth. and means tor connecting said passageways with said well and the high pressure sides of said barrel, and a discharge conduit for compressed duid leading from said well.

3. In a motor compressor unit, an hermetically sealed casing. a vertical electric motor in said casing. a hollow motor shaft, a truly elliptical barrel integral with said shaft and communicating with the interior thereof, a stationary cylindrical compressor block concentrically disposed in said barrel. a pressure duid well centrally disposed in said block and in communication with the hollow ci said shaft, transverse recesses in the periphery ot said block, radially movable headsinsaid recesses adapted to engage the inner periphery of said barrel and. dividing said ellipse into high and low pressure sides, means for constantly' forcing said heads outwardly, a iluid inlet in the casing adjacent the underside o! said block, a News! through said block from said inlet to said low pressure side, a passageway through said block from said high pressure side to said well, means placing the upper end of said hollow shaft and in turn said well in communication with said casing, and a discharge passageway leading from said casing.

4. A motor compressor unit as claimed in claim 3 including a lubricating oil reservoir in the lower portion of said casing. means for circulating said lubricating oil with the iiuid to be compressed through said unit. and means for separating said lubricating oil from the compressed iluid and for returning the same to said reservoir.

CLAUD HIKING DAVIS. 

